I added benchmarks to measure how fast the parallel remove_all code was
-- it turns out, about 3x slower than stdfs::remove_all. Since this was
the case, I removed all of the parallelism and rewrote it serially, and
ended up about 30% faster than stdfs::remove_all (in addition to
supporting symlinks).

In addition, I did the following three orthogonal changes:
  - simplified the work queue, basing it on Billy O'Neal's idea
  - Fix warnings on older versions of compilers in tests, by splitting
    the pragmas out of pch.h.
  - Ran clang-format on some files

In fixing up remove_all, the following changes were made:
  - On Windows, regular symlinks and directory symlinks are distinct;
    as an example, to remove directory symlinks (and junctions, for that
    matter), one must use RemoveDirectory. Only on Windows, I added new
    `file_type` and `file_status` types, with `file_type` including a new
    `directory_symlink` enumerator, and `file_status` being exactly the
    same as the old one except using the new `file_type`. On Unix, I
    didn't make that change since they don't make a distinction.
  - I added new `symlink_status` and `status` functions which use the
    new `file_status` on Windows.
  - I made `Filesystem::exists` call `fs::exists(status(p))`, as opposed
    to the old version which called `stdfs::exists` directly.
  - Added benchmarks to `vcpkg-test/files.cpp`. They test the
    performance of `remove_all` on small directories (~20 files), with
    symlinks and without, and on large directories (~2000 files), with
    symlinks and without.

* [vcpkg] Modify Filesystem::remove and Filesystem::rename to not throw.

* [.gitignore] Ignore new VS2019 CMake integration default location

* [.gitignore] Ignore CMakeSettings.json in toolsrc

* [vcpkg] Time external processes called with System::cmd_execute

* [vcpkg] Work around VS2019 CMake bug

* [vcpkg] Fix several unused variable warnings.

* [vcpkg] Improve error handling in vcpkg::Files::Filesystem

Always require either std::error_code or LineInfo to print better errors.

* [vcpkg] Fixup missing return value.

Drive by fix: silence warnings in tests.

* [vcpkg] Fix exiting in error_code overload

Drive by fixes for /analyze with VS2019

* some libraries export <PackageName>LibraryDepends.cmake
instead of <PackageName>Targets.cmake.
Those file also need the fix of #1044

should close #4753

* prefered the general solution #4622.
hopefully solved the issue within #4150
replaced the regex with something more readable
(also ident is lost)

should close:
#4753
#4633
#4150
and maybe more

* Hash vcpkg_fixup_cmake_targets.cmake

* [boost] Fix use of find_package(Boost) with cache variables
[socket-io-client] Fix install

* reversed change back to use regex replace

* [glbinding] Fix _IMPORT_PREFIX depth in *-export.cmake files

* [tinyspline] Ignore warnings treated as errors

* [libevent, liblemon, libpng, smpeg2, zlib] Fix apply patches

* [libsodium] Fix apply patches

* [folly] Link correct libraries in debug and release

* [vtk] Remove unset of _IMPORT_PREFIX

* [tinyspline] Do not treat warnings as errors

* [smpeg2] Fix double* to int comparison

* [nvtt] Define value for HAVE_UNISTD_H in MacOS

* [libui] Fix MacOS X build

* [zlib] Fix download URL

* [qhull] Update to v7.2.1

* [podofo] Set value for HAVE_UNISTD_H in MacOS

* [mongo-cxx-driver,ogre,podofo,qhull] Bump CONTROL version

* [mongo-c-driver] Set _IMPORT_PREFIX

* [tmxparser] Bump CONTROL version

* [qhull,vxl] Bump CONTROL version

Avoids case-sensitivity issues, flattens the layout, no Win32 but x86 instead
Issue #4586

This directory gets generated by `bootstrap-vcpkg.sh` on Linux, but
should not be in version control.

Previously it would also ignore vcpkg subdfolders

[ci skip]

script) from the git repo